drm/i915/perf: fix perf enable/disable ioctls with 32bits userspace

BugLink: http://bugs.launchpad.net/bugs/1731961
commit 7277f755048da562eb2489becacd38d0d05e1e06 upstream.

The compat callback was missing and triggered failures in 32bits
userspace when enabling/disable the perf stream. We don't require any
particular processing here as these ioctls don't take any argument.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: eec688e1420 ("drm/i915: Add i915 perf infrastructure")
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024152728.4873-1-lionel.g.landwerlin@intel.com
(cherry picked from commit 191f896085cf3b5d85920d58a759da4eea141721)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index f33d90226704108e71ee5662e01977e32b627fcb..1c3f9253377812eb939949c2cb6fa66ed9596d5f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2480,6 +2480,10 @@ static const struct file_operations fops = {
        .poll           = i915_perf_poll,
        .read           = i915_perf_read,
        .unlocked_ioctl = i915_perf_ioctl,
+       /* Our ioctl have no arguments, so it's safe to use the same function
+        * to handle 32bits compatibility.
+        */
+       .compat_ioctl   = i915_perf_ioctl,
 };